population pyramid recap

• men are always on the left and the women are always on the right
• cup shape decreases in population 
• demographic transition 
• as a country moves from pre- industrial society move to industrial 
• move to industrial 
• then to post industrial 
• the United States is not in the industrial phase anymore anymore because other countries make mostly everything for us 
• increased education and more opportunities for women causes a decrease in the amount of babies being born 
• Hans Rosling--- world studies researcher